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a)(x-13)=1
x=1+13
x=14
x=14
b)12+3x=6
3x=6-12
3x=(-6)/:3
x=(-2)
c)2x+3=5
2x=5-3
2x=2/:2
x=1
d)5-(x-3)=4
5-x+15=4
20-4=x
16=x
e)4-(x-3)=5
4-x+12=5
16-5=x
11=x
2)x+2=2x
2=2x-x
2=x